atom
n. 原子
An atom is the smallest amount of a substance that can take part in a chemical reaction.
A methane molecule is composed of one carbon atom attached to four hydrogens.
甲烷分子由1个碳原子与4个氢原子构成。
1. (physics and chemistry) the smallest component of an element having the chemical properties of the element
2. (nontechnical usage) a tiny piece of anything
molecule, atom, particle, speck, grain
这些名词均有"粒,微粒"之意。
The neutrons and protons form the core of the atom.
中子和质子构成了原子核.
Alcohol: Organic compounds characterized by a hydroxyl group ( OH ) bonded to a carbon atom.
醇 ( 酒精 ): 是有机化合物.它是一个氢氧团和碳原子的结合.
That cannot get up an atom of sympathy for them.
那并不能激发起人们对他们的丝毫同情.
We hadn't an atom of food.
我们没有一点食物了.
Matches the previous atom zero or one times, while consuming as little input as possible.
匹配前面的原子零次或一次, 但尽可能少地消耗输入.